Smoke-preventing furnace.



No. 772,092. PATENTED OCT. 11, 1904. J. M. ERIGSON.

SMOKE PREVENTING FURNACE. APPLICATION FILED MAR. 10, 1904.

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110.772.092. PATENTED 0OT.11, 1904.

' J. M. ERICSON.

SMOKE PREVENTING FURNACE.

APPLICATION FILED MAR.10, 1904.

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No. 772,092. PATENTED OCT. 11, 1904. N J. M. ERICSON SMOKE PREVENTING FURNACE.

. EAPPLIGATION FILED MAR. 10, 1904.

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Patented October 11, 1904.

PATENT OFFICE.

JOHN MARSHALL ERIOSON, OF SALT LAKE CITY, UTAH, ASSIGNOR OF ONE-HALF TO THOMAS W. JENNINGS, OF SALT LAKE CITY, UTAH.

SMOKE-PREVENTING FURNACE.

SPECIFICATION forming part of Letters Patent N 0. 772,( )92, dated October 11, 1904.

Application filed March 10,1904.

' To all whom it may concern:

Be it known that I, J OHN MARSHALL EnrosoN, a citizen of the United States, residing at Salt Lake City, in the countyof Salt Lake and State of Utah, have invented a new and useful Smoke-Preventing Furnace, of which the following is a specification.

This invention'relates to boiler-furnaces, and more especially to that class of furnaces which are used in connection with return-flue boilers, the object of the present invention being to provide a construction which shall be eflicient to promote a thorough combustion of the gases, soot, and other unconsumed particles, which in furnaces of ordinary construction are permitted to escape in the form of smoke, the improvement thereby efiecting an important saving in fuel, besides avoiding the highly objectionable emission of smoke.

With these and other ends in view the invention consists in the improved construction, arrangement, and combination of parts, which will be hereinafter fully'described, and particularly pointed out in the claims.

In the accompanying drawings has been illustrated a simple and preferred form of embodiment of the invention, it being, however, understood that I do not necessarily limit myself to the structural details therein exhibited, but reserve the right to such changes, altera tions, and modifications as may come fairly within the scope of the invention and which may be resorted to without departing from the spirit or sacrificing the utility of the same.

In said drawings, Figure 1 is a longitudinal sectional View of a boiler-furnace constructed in accordance with the principles of the invention, taken on the line 1 1 of Fig. 2. Fig. 7 2 is a horizontal sectional View taken on the line 2 2 in Fig. 1. Fig. 3 is a transverse sectional view taken on the line 3 3 in Figs. 1 and 2. Figs. 4 and 5 are horizontal sectional views illustrating modifications.

Corresponding parts in the several figures are indicated by similar numerals of'reference.

1 designates the boiler; 2, the front furnacewall; 3, the rear wall; 4, the fire-box, and 5 the ash-pit. Access may be had to the fire-' Serial No. 197,482. (No model.)

box and the ash-pit through doors 6 and 7 of ordinaryconstruction. (Conventionallyshown in the drawings.)

8 designates a bridge-wall which forms an intermediate support for the boiler and which is provided with a'vertically-disposed rela tivel y narrow slot'or opening 9 for the passage of the products of combustion.

1O 10designate two walls or partitions which extend from the bridge-wall to the front wall 2, converging in the direction of the latter, said walls including a wedge-shaped space 11, widening greatly in a rearward direction and communicating at its rear end with the slot or opening 9 in the bridge-wall, which while relatively narrow, as stated, is of a width equal to the extreme width of the space 11. The upper edges of the walls 10 10 slope downwardly in the direction of the front wall, as will be clearly seen in Figs. 1 and 2 of the drawings. The space 11 between the walls 10 10 is bridged up to the level of the lower side of the slot 9 in the bridge-wall. As will be'seen from the foregoing, the walls 10 10 serve to divide the fire-box into three separate compartments-namely, the side compartments 12 12, having independent feed-doors '6 and each constituting a fire-box, and the intermediate combustion-chamber 11. Each of the compartments of the fire-box is provided with a grate 14.

15 designates a smoke chamber or passage in rear of the bridge-wall, access to which may be had through a door 16 in the rear wall for the purpose of cleaning said passage, as Well as the return-fines 17 in the boiler.

When the furnace is in operation, the sheets of flame rising from the compartments of the fire-box are deflected forcibly in the direction of each other across the inclined upper edges of the partition-walls 1O 10, which being higher at their rear ends than at their front ends will compel the sheets of flame to rise previous to being deflected in the direction of the slot or opening 9, through which the gases and other products of combustion pass into the smoke-passage 15. The sheets-of flame being thus forced to impinge against each other are caused to consume to a very large degree the previously-unconsumed particles, the consumption of which is largely promoted owing to the intensely-heated condition of the space 11 between the walls 10, which said space constitutes a combustion chamber. It is found entirely unnecessary under normal conditions to inject either steam or air into the furnace for the purpose of promoting combustion, thenecessary supply of oxygen being furnished through the ordinary draftopenings in the ash-pit doors. Under certain conditions, however, when it is desired to assist combustion by artificial means air or steam, or both, may be introduced through suitably-disposed pipes 20, extending from the front of the furnace under the bricked-up portion between the partition-walls 1O 10 and discharging near the rear ends of the furnacechambers, said pipe being provided with suitable upward extensions forming the air or steam exits. These pipes are to be made of suitable diameter to admit of the insertion of a suitable tool for cleaning purposes, or they may, if desired, be cleaned whenever necessary by means of steam blown therethrough. The combustion chamber or space 11, as has been repeatedly observed, widens in the direction of the discharge-opening 9, so that the escape of the products of combustion into the chamber 15 will in no wise be retarded. Combustion continues to take place during the passage of the products of combustion through the chamber 15 and through the fines 17, and by the time the smoke-arch, which will be found in the drawings designated 18, has been reached the remaining gases will be discharged through the stack 19 in an almost colorless condition.

Under the modification illustrated in Fig. I of the drawings the bridge-wall (here designated 22) instead of being extended in a straight line transversely between the sides of the furnace is made curved, the edges of said bridge-wall being made to diverge in a rearward direction. Under the modification illustrated in Fig. 5 the bridge-wall is com-- posed of a base 23, extending transversely in a straight line between the sides of the furnace and extending upwardly to the lower edge of the slot 9, said base serving to support rearwardly-diverging wings 24:, which are connected at their front edges with the rear edges of the side walls 10. By either of these constructions the gases arising from the opposite chambers or fire-boxes will be deflected toward the side walls and return over the grate-surface for more complete combustion.

It is obvious that by producinga most thorough combustion aconsiderable saving in fuel will be effected; but in addition to this the improved device possesses an important advantage in this, that whenever desired the fire may be permitted to go down in either one of the compartments of the fire-box. This is a great practical advantage, especially in plants where boilers at times are taxed to the utmost to furnish a'sufficiency of steam while at other times only a low boiler-pressure is required. In such cases the necessary regulation may be had and fuel be greatly economized, as will be readily understood.

This improvement is of such a nature that it may be easily and at a small expense applied to boiler-furnaces of ordinary construction, the principal change required being that of building the partition-walls and altering the bridge-wall.

Having thus described my invention, I claim 1. In a boiler-furnace, a bridge-wall having a relatively narrow vertically-disposed opening, partition-Walls in the fire-box inclosing between them a combustion-chamber of a width greatly increasing in a rearward direction and connected at its rear end with the slot in the bridge, and pipes extending under said combustion-chamber from the outer side of the furnace, said pipes being constructed to discharge into the rear ends of the fire-box compartments adjacent to the partition-walls.

2. In a boiler-furnace, a curved bridge-wall having a convex front side provided with a vertically disposed, relatively narrow opening, and partition-walls in the fire-box inclosing between them a com bustion-chamber of a width greatly increasing in a rearward direction and connected atits rear end with the slot in the bridge-wall, grates in the compartments of the fire-box adjacent to the central combustion-chamber, and pipes for the passage of air, steam and the like disposed to discharge into the spaces between the corners of the bridge-wall and the rear ends of the grates.

3. Inaboiler-furnace of the class described, and comprising two fire-box compartments, grates supported therein and an intermediate combustion-chamber, a bridge-wall having rearwardly-diverging side members atthe inner ends of the fire-box compartments, and draft-pipes disposed to discharge into the spaces between the rearwardly diverging members of the bridge-wall and the-inner ends of the grates.

In testimony that I claim the foregoing as my own I have hereto afiixed my signature in the presence of two witnesses.

JOHN MARSHALL ERIGSON.

\Vitnesses:

H. W. LAWRENCE, J. W. ROOKLIDGE. 

